Physique

Adiabatic change

Photoelectric effect

A brightly polished Zinc plate on an electroscope is negatively charged.
When lit with the Hg vapour lamp, the electroscope discharges again.
The plate is not discharged if a glass sheet is held between
the lamp and zinc plate or the electroscope is pos ...

Détermination de la radiation radioactive avec la chambreàbrouillard selon wilson

Visualisation du champ magnétique d'une bobine

Principle

Current-carrying coils have a magnetic field around them which resembles that of a bar magnet. Inside the coil, the magnetic field lines are parallel to the axis of the coil. The direction of the field depends on the direction of the current in the coil. The magneti ...

The forces between the primary and secondary coils

Principle

This experiment demonstrates the force on a closed conductor in which current is being induced. Using DC in the primary coil, there is a pulse as the power is turned on and the coil is forced away. Using AC, the coil hovers over the primary coil.

Model of a high voltage long distance line

Principle

When electrical energy is transmitted over long distances, it is unavoidable that there will be losses due to resistance in the lines. Using transformer stations and high-voltage transmission lines can drastically reduce such losses. To model such lines, two wires o ...

Coupled pendula

Principle

Oscillations occur in physics in an extremely wide range of occurrences.They are macroscopically visible in the swinging and cushioning of cars or suspension bridges. In Nature, however, there is as a rule never a single oscillation but always only co ...

Self maintained discharge of gases in the discharge tu-be,pohl type

Principle

A gas discharge tube is connected to a vacuum pump. Applying a high voltage causes a variety of light phenomena in the tube, which are dependent on the pressure at that moment. The 0...10-kV high-voltage power supply used here (13670-93) is particularly appropriate ...

Generation of électric currentby means of à pelton turbine

Barkhausen effect,Weiss domains

Absorption spectra

Principle

Electron shells of metal atoms in the gas phase can be elevated to an excited state by light. If light is passed through the metal vapour, various lines will be absent from its spectrum afterwards. These lines correspond to the energy levels of those electrons in th ...

Frequency of waves

Principle

In this experiment a geared motor (30:1 ratio) is used to drive the elastically coupled elements of a wave machine via an eccentric. In order to suppress reflections at the open end of the oscillating system, the small bars under the oscillating pieces are allow ...